Top 3 Free online MBOX to PST Converters

Whether you are moving from an MBOX-supporting email client like Thunderbird to Outlook or want to access old emails in your Outlook, you will need to convert MBOX to PST format. Many users prefer a free utility that works online and quickly converts the mailbox file without the need for installing any additional software.

If you search for “mbox to pst converter for free online” on the internet, you will find many MBOX to PST converters that are desktop-based applications. However, there are only a few MBOX to PST converters that work online.

In this post, we will test and review 3 online MBOX to PST converter freeware we found while searching online. Read further to find more information on these online services, followed by our advice on how to select a suitable free MBOX to PST converter for your needs.

Top 3 MBOX to PST Converter Freeware?

While searching for a way to convert MBOX to PST for free, we found 3 online services – Stellar Free MBOX to PST Converter Online, Aspose MBOX to PST Converter and FILEFORMAT MBOX to PST Converter.

Let’s learn about them in detail.

Stellar Free MBOX to PST Converter Online

The first MBOX to PST converter freeware we tested is the free MBOX to PST converter online by Stellar. It is a powerful service that you can use to convert a single MBOX file of size not more than 100MB to Outlook-importable PST format for free. This online utility supports MBOX files of 17+ email clients, including Apple Mail, Mozilla Thunderbird, and Eudora. Moreover, as it is an online tool, users can use it on any Windows, Mac, or Linux system. It is also available as a Premium edition, which costs $19.99 and lets you convert up to 5 MBOX files of size ≤5GB.

During our test, we used an MBOX file of around 100MB that was exported from Thunderbird. The whole process of uploading the MBOX file and converting it was quick and easy. And in no time, the file was converted to PST format.

Another great thing to highlight about this tool is how it safeguards user privacy. The converted mailbox file (PST) can be downloaded within 3 hours (Free version) and 24 hours (Premium version) of MBOX to PST conversion. After which, the converted file is deleted automatically from the servers.

Pros	Cons
Converts an MBOX file of up to 100 MB for free	Cannot convert more than 1 MBOX file even if the first file was smaller than 100MB
Easy, 3-step process: Upload > Convert > Download	Doesn’t show individual emails in the preview
No need for the Outlook client to be installed on the PC	Premium edition allows only 5 MBOX files to be converted to PST
Preview mailbox folders using the downloadable HTML file	Users need to register to convert MBOX to PST for free
Uploaded and converted files are automatically deleted forever after the stipulated time from the servers
Works on Windows, Mac, and Linux

Aspose MBOX to PST Converter

The second MBOX to PST converter freeware that we tried is the Aspose MBOX to PST converter, which lets you convert a very small MBOX file (up to 1MB) to PST without even creating an account. It converts one or more MBOX files to a single PST file.

It supports batch conversion of the MBOX files. So, users can select and convert multiple MBOX files to PST in a single operation. It merges all the email messages into a single file named “Inbox” from different MBOX files. Because of this, the mailbox hierarchy is lost in the output PST file. However, it preserves the HTML and plain text parts of the message, along with attachments and embedded images.

During our test, we found that this software was able to convert the uploaded MBOX file quickly. However, the file size restrictions for the free edition prevented us from testing a larger MBOX file (10MB or more). So basically, the file size limits on the free version are only for very small exported MBOX files that contain very little data.

Aspose MBOX to PST converter is available as Free (unregistered user) and Free (registered user). Paid plans include the Premium edition that costs $4/month or $7 yearly. It also has a Business plan with a dynamic price that depends on the limits you choose.

Pros	Cons
No need to register to convert a small (≤1MB) MBOX file to PST for free	Extremely small file size limit in both the free editions.
Simple UI	No file preview option
The resultant PST file can be downloaded for 24 hours after conversion finishes.	Merges emails from multiple MBOX files into a single file during batch processing.

FILEFORMAT MBOX to PST Converter

FILEFORMAT MBOX to PST Converter is the last online utility that converts MBOX to PST for free. It can also convert MBOX files to other file formats like EML, EMLX, TML, ICS (Calendar file only), MHTML, MSG, OFT, OST, and PST. Users can also use this to upload files MBOX files from their Dropbox or Google Drive accounts.

While testing it, we found that the different options to save the MBOX file data are very useful. The file format menu eliminates the need to rely on separate tools for mailbox file conversion. We tested the MBOX to PST converter freeware utility with smaller MBOX files (≤10MB in size), and it was able to convert them without any issues.

The only problem we faced with this software is the UI. The sliding menu on the right sometimes collapses automatically after uploading the MBOX file.

The free version lets users convert a maximum of 5 MBOX files of size not more than 10MB each to PST or other file formats without creating an account. For more files, users can upgrade to the Basic version for a small subscription charge of $5/month, which can process 15 files of size ≤25MB per day. Above this is the Premium version that costs $55/year and can convert an unlimited number of MBOX files without any file size restrictions.

Pros	Cons
Fast MBOX file upload and conversion	Occasional errors while converting MBOX to PST format (due to an incompatible file selected or some other issue)
Allows users to upload files from Dropbox or Google Drive
Multiple options to save the MBOX file data
Sort the uploaded files in Alphabetical order.

Quick Comparison of the Different MBOX to PST Converter Freeware

Here’s a quick comparison between the 3 free online MBOX to PST converters we tested.

Tools	File size limit	No. of Files/Uses	File Saving Options	Batch File Conversion	Price
Stellar Online MBOX to PST Converter	≤100 MB for Free (Registered users), ≤5 GB for Premium users	Free – 1 Premium – Up to 5 files	HTML for previewing mailbox content and PST	No	Free – $0 Premium – $19.99
Aspose MBOX to PST Converter	1 MB for Free (Unregistered users) 5 MB for Registered users 50 MB for Premium users Custom file size for Business users	Unregistered – 5 Registered – 10 Premium – Unlimited Business – Custom	PST	Unregistered – 2 Registered – 10 Premium – 50 Business – Custom	Unregistered – $0 Registered – Free Premium – $4/Month or $7/Year Business – Custom
FILEFORMAT MBOX to PST Converter	10 MB/file for Free 25 MB/file for Basic No file size limit in Premium	Free – 5 Files Basic – 15 Files/dayPremium – Unlimited Files/day	EML EMLX TML ICS (Calendar file only) MBOX MHTML MSG OFT OST PST	No	Free – $0 Basic – $5/Month Premium – $55/Year

Our Verdict: Which MBOX to PST Converter Freeware to Choose?

After testing all three free MBOX to PST converters, we recommend Stellar’s Free MBOX to PST converter online as the best overall free MBOX to PST converter. Of the three, it is the only utility that offers a file size limit of 100MB in the free version. In comparison, both the Aspose and the FILEFORMAT MBOX to PST converter utilities offer limited file size support. Also, Stellar’s online MBOX to PST converter automatically deletes the converted files from its servers after 3 hours to safeguard user privacy. However, to convert the MBOX to PST for free, users are required to be registered.

In comparison, both Aspose MBOX to PST Converter and FILEFORMAT MBOX to PST Converter allow you to convert MBOX files to PST – though limited (in file size and number of files) – without even creating an account. This helps make the mailbox file conversion process a bit convenient.

Aspose MBOX to PST Converter also provides batch processing, with which you can easily convert multiple MBOX files to PST in one go. But it merges all the email messages of different MBOX files into a single folder named “Inbox” in the resultant PST file. This destroys the email hierarchy, thus making it difficult to locate emails from different mailbox folders.

Finally, if you need to convert your MBOX file to some other file format like EML, HTML, etc, then the FILEFORMAT MBOX to PST converter is the best freeware to go for. This is quite helpful when you have individual MBOX files for every mailbox data type – email messages, calendars, and more.

Axee Davies

Axee Davies is the founder of AxeeTech, publishing gaming guides, codes, and Windows how-tos since March 2013. A tech enthusiast for 13+ years — starting with smartphones and Android rooting — he now runs a site that puts out a new guide every day for Roblox players, traders, and Windows users. More about AxeeTech

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